Type I X-ray bursts and burst oscillations in the accreting millisecond X-ray pulsar IGR J17511-3057

Details Type I X-ray bursts and burst oscillations in the accreting millisecond X-ray pulsar IGR J17511-3057 Type I X-ray bursts and burst oscillations in the accreting millisecond X-ray pulsar IGR J17511-3057

2010-05-28

arxiv.org/abs/1005.5299v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

11 pages, 5 figures, MNRAS in press

Scientific paper

We report the discovery of burst oscillations at the spin frequency in ten thermonuclear bursts from the accreting millisecond X-ray pulsar (AMXP) IGR J17511-3057. The burst oscillation properties are, like those from the persistent AMXPs SAX J1808.4-3658 and XTE J1814-338, anomalous compared to burst oscillations from intermittent pulsars or non-pulsing LMXBs. Like SAX J1808.4-3658 they show frequency drifts in the rising phase rather than the tail. There is also evidence for harmonic content. Where IGR J17511-3057 is unusual compared to the other two persistent pulsars is that oscillations are not detected throughout all bursts. As accretion rate drops the bursts get brighter and their rise/decay time scales become shorter, while the oscillation amplitude falls below the detection threshold: first in the burst peak and then also in the rise. None of the bursts from IGR J17511-3057 show evidence for photospheric radius expansion (which might be expected to suppress oscillation amplitude) which allow us to set an upper limit to the distance of 6.9 kpc. We discuss the implications of our results for models of the burst oscillation mechanism.

Affiliated with

Also associated with

No associations

Rating

Type I X-ray bursts and burst oscillations in the accreting millisecond X-ray pulsar IGR J17511-3057 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Type I X-ray bursts and burst oscillations in the accreting millisecond X-ray pulsar IGR J17511-3057, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Type I X-ray bursts and burst oscillations in the accreting millisecond X-ray pulsar IGR J17511-3057 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-16128